Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. NOTE: The Radio must be on.
  NOTE: A front door must remain open whenever checking or erasing RADIO DTCs.
3. With the scan tool, run a Vehicle Scan Report, or record the Environmental Data related to the DTCs.
4. With the scan tool, erase all DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
8. With the scan tool, read DTCs.
NOTE:
Make sure the Radio is turned on.

NOTE:
A front door must remain open whenever checking or erasing RADIO DTCs.

Did the DTC return?

Yes
- Go To 2
No
- Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR PCM DTCS
1. With the scan tool, read PCM DTCs.
  NOTE:
  Repair any Lost Communication DTCs with the PCM before continuing with this diagnostic.
2. Check for any Crankshaft related DTCs.
  Were there any Crankshaft DTCs found in the PCM?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
ISOLATE AND CHECK THE (X478) ANC BUFFERED CRANK POSITION (+) CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note: The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
NOTE:
When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

Is the resistance below 3.0 Ohms?

Yes
- Go To 4
No
- Repair the circuit for an open or high resistance.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
ISOLATE AND CHECK THE (X479) ANC BUFFERED CRANK POSITION (-) CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note: The meter leads can add resistance to the measurement value.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
NOTE:
When probing a circuit at an Electronic Control Unit (ECU) harness connector, always use an appropriate back probing tool to prevent any possible damage to the ECU terminals.

Is the resistance below 3.0 Ohms?

Yes
- Go To 5
No
- Repair the circuit for an open or high resistance.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
REPLACE THE RADIO AND RETEST FOR DTCS
1. Replace the RADIO in accordance with the Service Information.
2. Turn the ignition on.
3. With the scan tool, erase DTCs.
4. Using the Environmental Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
5. With the scan tool, read DTCs.
Did the DTC return?

Yes
- Replace the PCM in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- Test complete.